Hi there mikemckenzie49,
If you're unable to receive emails for a specific account on your iPhone and iPad, you'll want to try working through these steps to see if they resolve the issue for you:
There are a few things to keep in mind and check:
- When you make an iOS or iPadOS backup in iCloud or iTunes, it backs up your mail settings, but not your email. If you delete or change your email account settings, previously downloaded emails might be removed from your device.
- Make sure that your device is connected to the Internet.
- Check with your email service provider to find out if there's a service outage.
- If you can't access your email, or you can't send and receive messages with your @icloud.com email address, learn what to do.
If the issue persists, work through the remaining suggestions in this support article: If you can't receive email on your iPhone, iPad, or iPod touch - Apple Support
Keeping that in mind, based on the error message you're seeing, it sounds like there may be an issue on Comcast's end. You'll want to be sure to reach out to them for more help.
Take care.